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Method and Apparatus for Realizing Space Division Multiplexing

Active Publication Date: 2010-06-10
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]In consideration of the above mentioned, the main object of the present invention is to provide a method and an apparatus for realizing space division multiplexing, which are able to realize space division multiplexing reasonably with accuracy.
[0039]In the present invention, multiple different modes could be adopted for realizing how to calculate space division isolation between users, more particularly, three methods for space division multiplexing pre-grouping based on channel estimation are provided, so that the scope of application is broader and the calculating mode is more flexible and comprehensive. Wherein the solution for calculating space division isolation based on capability of interference suppression suggests a method for calculating space division isolation in the case of optional beamforming. Even in the case of beamforming without interference suppression, it is still possible to perform space division multiplexing. Combing said method directly with the beamforming algorithm, it represents interference suppression realizable by receiving / transmitting beamforming, which provides most direct reference for the space division multiplexing. Moreover, regarding the calculation of space division isolation between users, several differences under different factors and different conditions are further taken in consideration in the present invention, for instance: definite and specific calculation modes are provided respectively for a power control system and a system without power control as well as for two users and multiple users, so that the realization of space division multiplexing is more perfect, more exact, and more reasonable.
[0040]In the present invention, in construction of user group list for space division multiplexing, the mode of traversing all users and calculating space division isolation between all users can be used to obtain a complete user group list for space division multiplexing; it is also allowed to select part of users as required when an event is triggered and calculate space division isolation between the selected users, so as to obtain an incomplete user group list for space division multiplexing, thereby the operation is convenient and flexible.

Problems solved by technology

However, in the current available solution, only the method for performing interference suppression between two users multiplexing a single resource by beamforming is provided, wherein the interference suppression is performed by aiming the main beam to the desired user and aiming nulls steering to the interfering user by beamforming based on space information of the desired user and the interfering users.
However, the performance and effect of the interference suppression between two users cannot be ensured, it totally depends upon beamforming algorithm.
Especially, the downlink beamforming is further influenced by error introduced by the beamforming delay.
Evidently, the prior art fails to definitely provide a method for realizing space division multiplexing and fails to suggest how to ensure the effect and accuracy of space division multiplexing.

Method used

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  • Method and Apparatus for Realizing Space Division Multiplexing

Examples

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embodiment 1

[0065]In this embodiment, the definition and calculation of space division isolation is conducted based on the capability of interference suppression; only two users are considered; the current mobile communication system does not have power control; the set space division isolation threshold is power ratio.

[0066]Space division isolation is calculated between each two of all the users or part of the users covered by the current base station. Here, the space division isolation of the two users refers to the interference suppressing performance to the signal of the user n when the signal of the desired user m is transmitted while being beamformed in the case of a given beamforming algorithm In uplink, the space division isolation of the user m to the user n refers to the power ratio of the received signal of the desired user m to that of the interference user n; in downlink, the space division isolation of the user m to the user n is defined as the power ratio of the desired signal (s...

embodiment 2

[0080]In this embodiment, the definition and calculation of space division isolation is conducted based on the user's space power spectrum; only two users are considered; the current mobile communication system does not have power control; the set space division isolation threshold is absolute power value.

[0081]There are many methods for estimating the space power spectrum, a simple example is Bartlett spectrum, which is easy to calculate. Of course, in the present invention the method for defining and calculating the space division isolation of the user based on space power spectrum is not limited as Bartlett spectrum estimation, other methods such as Capon spectrum estimation, Music spectrum estimation etc. may also be applied. Here only the Bartlett spectrum is taken as an example.

[0082]The Bartlett normalization power spectrum is estimated as:

 {p_m(ϕ)=aH(ϕ)R_xx(m)a(ϕ)max(aH(ϕ)R_xx(m)a(ϕ))p_m(ϕ)=aH(ϕ)Rxx(m)a(ϕ)max(aH(ϕ)R_xx(m)a(ϕ))

[0083]Wherein φ includes intervals in which the u...

embodiment 3

[0088]In this embodiment, the definition and calculation of space division isolation is conducted based on the user's direction of arrival; only two users are considered; the current mobile communication system does not have power control; the set space division isolation threshold is angle of arrival.

[0089]The user's spatial angle of arrival is estimated based on the space power spectrum of the user. In Embodiment 2, many methods for estimating the user's space spectrum are described and the example of Bartlett spectrum estimation is provided, the user's direction of arrival can be defined as the direction in which the maximum value of the user's space power spectrum lies:

ϕm=argmaxϕ(p_m(ϕ))

[0090]The above formula means: φm is φ the that makes pm (φ) maximum, which is just the direction of arrival of the use m. The user space division isolation defined based on the user's direction of arrival may be the two users' angle difference of arrival:

ϒ_m,n(3)={ϕm-ϕn,ifϕm-ϕn≤180°360°-ϕm-ϕn,el...

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Abstract

A method for realizing space division multiplexing is provided. The method comprises steps as follows: A. acquiring space information of users, and calculating space division isolation between the users based on the acquired space information; B. generating a set of user groups for the space division multiplexing based on the space division isolation between users calculated in step A; C. selecting a user group from the set of user groups for the space division multiplexing generated in step B and allocating the same physical resource to two users among the selected user group when conducting the space division multiplexing. An apparatus for realizing space division multiplexing is further provided. Using said method and apparatus, the space division isolation can be realized reasonably with accuracy.

Description

TECHNICAL FIELD[0001]The present invention relates to multiplexing technique in mobile communication system, especially relates to method and apparatus for realizing space division multiplexing.BACKGROUND ART[0002]With increase of the number of users in mobile communication system, how to utilize radio spectrum resources more sufficiently and better becomes an important problem to be solved, and now the most commonly used mode is resource multiplexing. In the available mobile communication system, basic radio spectrum resources usually include frequency resources, time resources and code resources, and correspondingly, frequency division multiplexing (FDM), time division multiplexing (TDM), code division multiplexing (CDM), or their combination can be carried out based on those basic radio spectrum resources.[0003]Since the 90s, beamforming techniques are applied broadly in the mobile communication system, and the beamforming technique is significantly applied in two aspects: one is...

Claims

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Application Information

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IPC IPC(8): H04W40/04H04J4/00
CPCH04B7/0452H04B7/0697H04B7/0617H04L5/0037H04L5/0062H04L5/0023
Inventor SUN, CHANGGUOWANG, YINGMINSUO, SHIQIANGSUN, SHAOHUI
Owner DATANG MOBILE COMM EQUIP CO LTD
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